Moon Cake - cooking recipe

Ingredients

1/2 lb. butter
5 egg yolks
1 1/2 c. flour
1 tsp. baking powder
5 egg whites
1 1/2 c. sugar
1 tsp. vanilla
powdered sugar
walnuts, chopped

Preparation

Cream butter, egg yolks, sugar and vanilla.
Add flour and baking powder.
Fold in stiffly beaten egg whites.
Pour into greased and floured 9 x 13 pan.
Sprinkle walnuts on top.
Bake 25 minutes.
Cut with thin-rimmed glass.
First cut will be round. Make second cut halfway through first cut, etc.
Sprinkle with powdered sugar.